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Stephanie GreenstreetStephanie Greenstreet 

How do I update the Opportunity Stage based on Activity Type?

I would like to auto-update the Opportunity Stage based on the Activity Type of last activity. The only caveat is that the stage can not move up the funnel, only down the funnel.
Jim RaeJim Rae
There are many ways to do this, but not with a formula.
You could use Process builder and/or Flow or even a trigger.